They have arrived at lunchtime but their flight was delayed. A．will B．can C．must D．should 题目和参考答案——青夏教育精英家教网—

题目内容

They ________ have arrived at lunchtime but their flight was delayed.

A．will

B．can

C．must

D．should

D解析：should have done意为“本该做某事但实际上未做”，符合句意。句意：他们本该在午饭的时候到达，但是他们的航班延误了。A项为将来完成时；B项的can表推测，不能用于肯定句中；C项构成must have done结构，表示“一定做过某事”。

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A. Taking risks

B. Fighting off enemies

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C. People should take risks when they are young

D. We can always achieve our goals by taking risks

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B. On risks taken by ancestors

C. Live our life to the fullest(充分地)

D. No risk, no gain.

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Of the men, 80 percent were in one of the professions or in business, managerial or semiprofessional jobs. The women who had remained single had offices, business, or professional occupations.

The group had published 90 books and 1,500 articles in scientific, scholarly, and literary magazines and had collected more than 100 patents.

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A. that gifted adults can be as intelligent as when they were young

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D. that when the bright children grow up, they become ordinary

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A. most of the gifted children became white-collar workers

B. half of the gifted followed up graduated from colleges

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C. The gifted men got full marks on intelligence tests.

D. Most of the gifted appeared satisfied with their life.

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A. earning their living and keeping promises

B. doing practical jobs and facing reality

C. doing what they have promised

D. realizing what they were expected

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